Analyses of unevenness and hairiness on blended yarns

In this thesis, unevenness and hairiness of yarns made of blends of recently widely used regenerated cellulosic fibres Tencel, Modal and Promodal with cotton were investigated.The aim of the study was to investigate the effects of spinning system, blend type, blend ratio, yarn linear density and twist level on unevenness and hairiness values of the blended yarns.Structural, physical and mechanical properties of cotton-Tencel and cotton-Promodal blended ring, compact and vortex spun yarns were compared to analyze the effects of different spinning systems on yarn properties. Results showed that, hairiness values of ring yarns are the highest and vortex yarns are the lowest. In regard to unevenness, compact yarns have the best and vortex yarns have the worst values. In addition, effects of different blend ratios on yarn?s structural, physical and mechanical properties were examined.In the study, the hairiness values obtained from Zweigle G566, Uster Zweigle Hairiness Tester 5 (UZHT5) and Uster Tester 5 devices were investigated to compare the results of different hairiness testers. In general, correlations between the hairiness values of Zweigle G566 and UZHT5 hairiness testers, that use the same measuring principle, were found statistically significant.At last, single-jersey knitted fabrics were produced using blended yarns to investigate the effect of yarn spinning system and blend type on appearance and performance properties of the fabrics. To this end, pilling and abrasion tests were carried out.